i decided that having my hair back the way it used to be was an important step for me. >> myself, i'm 45 years old, and you know, i'm not in the best shape in the world, but one thing, i'm continually trying to get better, and my hair is just one less problem i ever have to think about. >> i feel blessed. i'm not worried about other people passing judgment or wondering what might be wrong with me. i don't second-guess going to the store or going to the movies or going to have a drink. i'm confident. i'm comfortable. >> welcome back. let's get right to the root of the problem-- hair loss and what causes it. now, hair loss affects more than 70 million people in north america today-- 40 million men and 30 million women. that's a lot of people. some people try products that claim to regrow hair only to find out a few hundred dollars later that they didn't work. don't waste your money on unproven remedies. if you care about how you look and you want to get your hair back, take time to listen to world-renowned hair loss expert dr. jon gaffney, medical director of hair club, a board-certifie